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A068158
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a(n) = floor[ n!/(R(n))! ], where R(n) = Digit reversal of n (A004086).
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 3628800, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1216451004088320000, 106661318400, 1, 0, 0, 0, 0, 0, 0, 0, 44208809968698509772718080000000, 1320509264105545113600000, 10178348544000, 1, 0, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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COMMENTS
| If n < R(n) then a(n) =0, n is a palindrome a(n) = 1 and for n > R(n) n!/(R(n)! = an integer.
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EXAMPLE
| a(21) = 21! / 12! = 51090942171709440000/479001600 = 106661318400.
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CROSSREFS
| Sequence in context: A116221 A118813 A127229 * A011521 A061603 A153761
Adjacent sequences: A068155 A068156 A068157 * A068159 A068160 A068161
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 24 2002
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